HP 41C DOES NOT BEEP

[Geoff Quickfall]

Okay, according to a guru, there were no halfnut 41Cs. That is not to say that HP service didn't have fun with labels at the foot of the 41c or the project team didn't play.

Now, having said that, what you have I have never seen. I always thought the halfnut with the rounded display and the large removable PCB replaced by the soldered half board was the last 41C variant.

That board looks to be a variant of the halfnut with the soldered half board fully replaced by the IC. It was probably kluged to a spare 41c keyboard shell and may be a prototype with a new chip. The project may have been shut down by the 42s development and 48 series.

So my guess is, unless someone can correct me, this is a prototype designed with 41c specs to test the new IC. If successful the memory, xtended functions and quartz timer would be added later, but that did not happen.

As I type this, a discussion with Wlodek comes to mind from years ago so I will see if he knows more about it. Maybe Richard does?

The bender (piezo) wires at the solder point look blackened, bad solder fix or is it just coloured. That may be the problem.

Geoff

Pictures of the serial number and more pics of the board with the black cover removed would be interesting.